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92 lines
2.7 KiB
C++
92 lines
2.7 KiB
C++
// Copyright (c) 2006-2010 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "sandbox/win/src/eat_resolver.h"
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#include "base/win/pe_image.h"
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#include "sandbox/win/src/sandbox_nt_util.h"
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namespace sandbox {
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NTSTATUS EatResolverThunk::Setup(const void* target_module,
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const void* interceptor_module,
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const char* target_name,
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const char* interceptor_name,
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const void* interceptor_entry_point,
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void* thunk_storage,
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size_t storage_bytes,
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size_t* storage_used) {
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NTSTATUS ret = Init(target_module, interceptor_module, target_name,
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interceptor_name, interceptor_entry_point,
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thunk_storage, storage_bytes);
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if (!NT_SUCCESS(ret))
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return ret;
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if (!eat_entry_)
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return STATUS_INVALID_PARAMETER;
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size_t thunk_bytes = GetInternalThunkSize();
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#if defined(_WIN64)
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// We have two thunks, in order: the return path and the forward path.
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if (!SetInternalThunk(thunk_storage, storage_bytes, NULL, target_))
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return STATUS_BUFFER_TOO_SMALL;
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storage_bytes -= thunk_bytes;
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thunk_storage = reinterpret_cast<char*>(thunk_storage) + thunk_bytes;
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#endif
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if (!SetInternalThunk(thunk_storage, storage_bytes, target_, interceptor_))
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return STATUS_BUFFER_TOO_SMALL;
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AutoProtectMemory memory;
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ret = memory.ChangeProtection(eat_entry_, sizeof(DWORD), PAGE_READWRITE);
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if (!NT_SUCCESS(ret))
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return ret;
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// Perform the patch.
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#pragma warning(push)
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#pragma warning(disable: 4311)
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// These casts generate warnings because they are 32 bit specific.
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*eat_entry_ = reinterpret_cast<DWORD>(thunk_storage) -
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reinterpret_cast<DWORD>(target_module);
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#pragma warning(pop)
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if (NULL != storage_used)
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*storage_used = GetThunkSize();
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return ret;
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}
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NTSTATUS EatResolverThunk::ResolveTarget(const void* module,
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const char* function_name,
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void** address) {
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DCHECK_NT(address);
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if (!module)
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return STATUS_INVALID_PARAMETER;
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base::win::PEImage pe(module);
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if (!pe.VerifyMagic())
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return STATUS_INVALID_IMAGE_FORMAT;
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eat_entry_ = pe.GetExportEntry(function_name);
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if (!eat_entry_)
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return STATUS_PROCEDURE_NOT_FOUND;
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*address = pe.RVAToAddr(*eat_entry_);
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return STATUS_SUCCESS;
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}
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size_t EatResolverThunk::GetThunkSize() const {
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#if defined(_WIN64)
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return GetInternalThunkSize() * 2;
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#else
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return GetInternalThunkSize();
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#endif
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}
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} // namespace sandbox
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